diff --git a/README.md b/README.md
index 0724d1b..fd64a91 100644
--- a/README.md
+++ b/README.md
@@ -85,6 +85,7 @@ Options:
 -class <class_name> specify class name (supported languages only). Default is `scc`, `SCC`.
 -prefix <function_prefix> specify prefix for functions. Default is `scc_` for languages does not support namespace/class, `` (empty string) for languages support namespace/class.
 -data_type <data_type_name> specify the name of the syntax node data type.
+-slex-h <header> specify header file slex generated.
 -slex-ns <namespace> specify namespace used in slex.
 -slex-class <class_name> specify class name used in slex.
 -slex-prefix <function_prefix> specify function prefix used in slex.